Yangon: Myanmar's junta has freed six political prisoners, including Thet Naung Soe, a student sentenced to 14 years in jail for staging a solo protest in 2002, an opposition lawyer said on Friday.

The five men and a woman were freed from Yangon's Insein prison on Thursday shortly after a visit by UN human rights ambassador Paulo Sergio Pinheiro.

Aung Thein, a member of the opposition National League for Democracy's (NLD) legal advisory committee, said five of those freed were NLD members.

Thet Naung Soe was said to have been in poor physical and mental health as a result of his time in prison.

Official media say all but 91 of the nearly 3,000 people arrested in September and October have been released.